This is an AI tool developed by Google, currently available for free. It serves as a "second brain" for reading and thinking—NotebookLM AI provides well-founded responses and is less prone to making things up. Its answers are strictly based on the documents you provide, and when responding, it even cites sources, such as indicating which page of your material the information comes from. You can also discuss the content with it, making it an excellent tool for taking reading notes. It’s perfect for analyzing professors' lectures or writing reflections on extracurricular books, and it can even be a valuable assistant when working on academic papers.